Girls, hi. Could you tell me if yesterday was a lot of training all ev…

Girls, hi. Could you tell me if yesterday was a lot of training all evening and night? Today in the morning my lower back hurts and my abdomen is sore, it's like during the first days of menstruation (noticeably so), and I feel like I want to go to the bathroom. But there are no contractions, even training ones. Just feelings and pain like during menstruation. What is this already starting? Or maybe it will pass and I am going through some time?